Adding-machine.



A. SPRUNG.

ADDING MACHINE.

APPLICATION mu) JUNE 24.1915.

%,21 9,878. Patented Mar. 20, 1917. N

2 SHEETS-SHEET l- WITNESSES'G u %MIVENTOR 7 Q g; s M

A. SPRUNG. ADDING MACHINE.

APPLICATION HLED JUNE 24. I915.

Patented Mar. 20, 1917'.

2 SHEETS-SHEET 2 pointed, out in the claims.

T 0 all whom it may concern:

ABRAHAM SPRUNG, OF NEW YORK, N. Y.

ADDING-MACHINE.

Specification of Letters Patent.

Application filed June24, 1915. Serial No. 36,025.

Be it known that I, ABRAHAM SrRUNG, a citizen of the United States, and a resident of New York, in the county of New York and State of New York, have invented ce'r tain new and useful Improvements inAdding-Machines, of which the following is a specification. This invention relates to improvements in mechanisms, for, obtainingthe sum of two or more numbers of varying denominations by manually operated numeral wheels, commonly known as adding machines.

' One object of this invention is to provldc an adding machine comprised of few parts,

unusually simple, easily operated and thoroughly efficient in obtaining accurate results.

within its scope. 4

Another ob ect is to provide a resetting device, which by a single lever movement,

brings all the several numeral wheels intoa position where the ciphers or zeros appear through the sight openings. 7 p

A further object is to provide means common to both the carrying device and the resetting device on which the operatlon of these mechanisms depends, and whereby the number of parts are reduced considerably and assembled in most compact and neat form. In accomplishing the above, I provide in combination with the operative parts of the adding and resetting devices, a hol low cylinder, which serves both as a cam for actuating the numeral wheels of higher order and as a means for controllingthe operation of the resetting lever which brings the numeral wheels back to their Zero positions, in a manner to be more fully hereinafter described.

Further objects and advantages will appear from the detailed description and the features of novelty will be particularly In the accompanying drawings, Figure -1 is a front elevation of an addingmachine made in accordance with the invention, parts being broken away and others appearing in section.

Fig. 2 1s a front view of the resetting shaft and its attachments.

Fig. 3 is an edge view of a numeral wheel.

Fig. 6 is a cross sectional view, taken on line 6-43 of Fig. 1.

Fig. 7 is a'perspective view of aresettingpawl.

Fig. 8 is a fragmentary perspective view of the comb spring.

Fig. 9 is a perspective view of a carryingover pawl, and

Fig. 10 is a perspective view of the fixed 1 cylinder.

It has been an-especial object to produce a mechanism that can compete favorably with the best existing machines of the class and which can 'be produced at a far less expense.

lo this end the parts are designedwith special reference to high grade, interchangeable construction, die finished castings and stamped parts being used throughout.

Referring in detail to the drawings, a pair of arcuate frames 15 are rigidly connected Patented Mar. 20, 1917.]

at the bottom to a plate 1,6 by means of the screws 17.

A casing 18,- of sheet metal is curved to suit the flanges 19 of the frames 15 and is further engaged by the flanges 20 of the bottom plate 16 so as to be firmly held in position. A

An annular shoulder 21 extends inwardly from each of the side frames and fitted to it a hollow cylinder 22 the ends of the cylinder being held tight against the inside of the frames by means of the bolt 23 which passes through the cylinder, drawingthe side frames together and clamping the easing as well as the cylinder.

Rota-tably mounted on the cylinder 22 are a plurality of numeral bearing wheels 25, each wheel having'three series of numerals from 0 to 9 inclusive shown on its periphery, which is closely adjacent to the interior of the casing 18, thenumerals showing, one at a time, through the sight openings 26 cut through the easing wall.

. .On one side of each wheel are a plurality of uniformly spaced projections'QT, corresponding in number and location with the numerals on the periphery, from which they extend laterally. These projections are 'so distanced as to receive between them a stylus, pencil point or other implement by which they may be rotated, the article used being inserted through slots 28 formed in the upper part of the casing.

, points 32 are reduced in thickness to avoid contact with the next wheel when operated and are normally pressed outward by means oi the springs 33 so, as to be in position to engage with the ratchet teeth of the next adjacent numeral wheel, the ends of the springs being held in a stressed position by pins 34-,

similar to the pawl pivot pins 56.

Lugs 35 formed with the p'awls extend sub- .stantially radially and ride upon the surface ofthe cylinder 22 being held thereby in such manner that the points 32 are maintained out of engagement with the ratchetteeth until the lugs 35 slip into an open groove 36 formed longitudinally in the surface of the cylinder, the groove being of such width as toallow the points 32 of the pawls to engage with one of the ratchet teeth and move it the distance of one tooth only, whereupon the lugs contact with the fixed edge of the groove, and as the wheels are moved around the cylinder, the lugs ride up on this edge and out of the groove, forcing the pawl out of engagement with the ratchet teeth 1, will be understood of course that the width of the groove, and the spacing and positioning of the pawls on the webs 30 are so designed that, when the tenth numeral on any of the wheels is being actuated, the next succeeding higher valued wheel is turned adistance of one numeral and so on through-- out the entire series of numeral wheels, the action being entirely automatic.

"In order to reset the numeral wheels to their Zero positions, there is revolubly mounted in bearings 37 and 38 formed with the end frames 15, a shalt -10, one end thereof extending through the bearing and. havmg secured to it an actuatinglever handle 41. The latter is provided on. its inner side with a lug 42 adapted to make contact with a stop 43 set on the outside of the adjacent end frame, thereb preventing over-actuation of the handle as opposed to the return. spring 44, which partially encircles the hub and is attached at its ends to the frame and shaft members respectively.

Secured to the shaft within the cylinder are a pair of dogs as bored at one end to receive the shaft 46 pivot-ally carrying pawls 47, which are'normally pressed outwardly by means of a comb spring l8 attached to a p rojection 49 at the other end of the dog's 4:5, said pawls 47 having a reduced point 50 adapted to extend through slots ol formed in the cylinder 22, engageable, when the shaft 40 1s rotated, with raised ring segments 52, formed wlth the hubs oit each of the wheels. l hus when the handle 41 operated the wheels are turned, bringing series of like characters into alincment, the zeros or ciphers showing through the sight openings 26 in a uniform row.

it will thus be seen that the hollow cylinder 22 by means of the longitudinal groove 36 to effect the carrying .over from one numeral wheel to the next of higher order, while the transverse slots 51 allow the operative pawls of the resetting mechanism to extend through them and engage the numeral wheels, The cylinder thus serves as a nucleus about which the parts of the carrying mechanism and resetting mechanism are assembled 1n order to hold the several numeral wheels quiescent during the actuation of others, the former having already reached their zero positions during the resetting process and also to correctly position them with reference tothe numbers exhibited, a comb spring 54 is attached to the inner surface of the bottom plate 16, the operative points 55 being curved and doubled back against the body of the teeth and adapted to engage with the spaces between the projections 27 provided for actuating the wheels. I

This comb spring is made of one piece as will appear from Fig 8, and thus one integral. member of very simple construction serves to keep the various numeral wheels in any position of adjustment.

in operation, a suitable implement being inserted in the slots 28 formed through the casing 18 to a depth sufficient to engage with the projections 27, the wheels are turned forward thereby adding any amount indicated by the numerals disposed on the surface of the casing adjacent to the poiiit of ent of the implement. F or instance if it be desired to addfive, the implement is inserted opposite the numeral in the slot of the first or unit wheel and drawn downward until the end of the slot has been reached, and so on for any other number or combination of numbers it is desired to add.

In resetting, it is necessary only to turn the crank handle as far as it will go whereupon the pawls carried by the dogs engage with the nearest segments on the numeral wheels and bring; the numerals into horizontal alinement, the pawls being spaced and guided in their movement by the slots in the cylinder.

Having thusdescribed my invention and pointed out the manner of its construction and operation what I claim as new and desire to secure by Letters Patent is 1. in an adding machine, a stationary hollow cylinder, a plurality or numeral wheels reroluljaly mounted thereon, carrying mechanism provided on the "Wheels, resetting n'icchanisni disposed in the interior of the cylinder, said cylinder being formed with an exterior groove for operating the carrying mechanism, and with transverse slots for the projection of the resetting mechanism from the interior to the exterior of the cylinder.

2. In an adding machine, a stationary hollow cylinder, a plurality of numeral wheels revolubly mounted thereon, said wheels being formed with segmental hub portions, re-

setting mechanism 'disposedin the interior of the cylinder and comprising a plurality tion by the shoulders, a plurality of numeral wheels revolubly mounted on said cylinder, carrying mechanism provided on the wheels, resettlng mechanism dlsposed 1n the interior of the cylinder, said cylinder havmg exterior means for operating the carrying mechanism, and interior means forcontrolling the resetting mechanism.

4. In anadding machine, a stationary hollow cylinder, a plurality of numeral wheels revolubly mounted thereon, carrying mechanism provided on said wheels, resetting mechanism disposed in the interior of the cylinder, said cylinder having a series of transverse slots for the projection of the resetting mechanism from the interior to the exterior ofthe cylinder, and an exterior 1ongitudinal groove for the operation of the Copies 0! this patent may be obtained for -arrying mechanism, said carrying mechanism comprising a set of pawlsmounted on each numeral wheel on one side thereof in operative relation to the next adjacentwheel, said pawls having an arm adapted to travel on the cylinder and operable by the groove when said arm drops into the latter, said arm being offset to clear the transverse slots in the cylinder.

5. In an adding machine of the class described, the combination of a casing, a tubular support mounted therein having a plurality of circumferential slots, a plurality of number wheels mounted upon the support, segmental flanges formed on the sides circumferentially of the number wheels and bearing upon the support and resting over the said slots, a shaft passing through said support concentrically therewith, arms extending from the shaft, a second shaft mounted in said arms, a plurality of pawls pivotally mounted upon said shaft and havling reduced terminals passing" through said slots and adapted to engage the said segmental flanges of the number wheels.

6. In an adding machine, a plurality of numeral wheels, carrying mechanism therefor, resetting mechanism for the numeral Wheels, and'a common element for control-' ling the operation of both the carrying and resetting mechanisms, said element comprising a stationary hollowsleeve on the exterior. of which the numeral wheels are mountedand in the interior of Which the resetting mechanism 18 d1sposed,'sa1d sleeve having a formation at the exterior thereof for con trollingthe operation of the carrying mechanism, and being cut away to permit themovement of there-setting mechanism from ABRAHAM sPRUNG.

five cents each, by addressing the Commissioner of Patents, Washington, D. C. 4 

